# Neurokeys vs BiAffect3

The clearest difference is update cadence: Neurokeys at every 2 weeks against BiAffect3's every 4 months. BiAffect3's advantage is iOS requirement (16.1 vs 18.2). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Neurokeys ships an update every 2 weeks, BiAffect3 every 4 months. The most recent releases landed on October 29, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Neurokeys | BiAffect3 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.9 (7 ratings)](https://appshunter.io/ios/app/biaffect3/id6451423106/reviews)** |
| Number of ratings | — | **7** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 4 months |
| Monetization | — | Free |
| Size | 186 MB | 30 MB |
| Requires iOS | 18.2 | **16.1** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Neurocast BV](https://appshunter.io/developer/1252625745) | [University of Illinois](https://appshunter.io/developer/422670617) |

## What reviewers say

### Neurokeys

[App page](https://appshunter.io/ios/app/neurokeys/id1436297061)

**In-app purchases:** none


### BiAffect3

[App page](https://appshunter.io/ios/app/biaffect3/id6451423106)

This app helps you track your mood and cognitive function using your iPhone's keyboard and sensor data. It analyzes typing patterns to provide insights into mental health and assists researchers in developing better diagnostic tools for mood disorders.

**Highlights:** Mood tracking, Neurocognitive functioning assessment, Keystroke dynamics analysis, Sensor data collection, Mental health insights, Research participation

**In-app purchases:** none


## Frequently asked questions

### Is Neurokeys free?

Neurokeys is free to download, with no in-app purchases.

### Is BiAffect3 free?

BiAffect3 is free to download, with no in-app purchases.

### Do Neurokeys or BiAffect3 have ads?

Neither Neurokeys nor BiAffect3 shows ads.

### Which is updated more often, Neurokeys or BiAffect3?

Neurokeys ships an update every 2 weeks, and BiAffect3 every 4 months. Most recently, Neurokeys was updated on October 29, 2026 and BiAffect3 on November 3, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*